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IAUC 6136: A0538-66; C/1994 T1

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                                                  Circular No. 6136
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444     TWX 710-320-6842 ASTROGRAM CAM
MARSDEN@CFA.HARVARD.EDU or GREEN@CFA.HARVARD.EDU (science)


A0538-66
     R. Corbet and A. Smale, Goddard Space Flight Center and
Universities Space Research Association; and P. Charles and K.
Southwell, Oxford University, write: "The recurrent x-ray transient
A0538-66 (16.65-day period) remains active although at a low level.
ASCA observations on Feb. 3 (predicted x-ray maximum) and 4 gave
GIS count rates of about 0.1 and 0.05 counts/s, respectively.  The
estimated luminosity of 2 x 10E36 erg/s is much less than the
largest outbursts previously observed.  Photometry from the South
African Astronomical Observatory yielded the following (conservative
errors of 0.03 mag):  Jan. 31, V = 15.05; Feb. 1, 14.67; 2, 14.99;
3, 14.86; 4, 14.98; 5, 15.04; 6, 15.04.  Spectra obtained at the
Anglo-Australian Telescope on 1994 Nov. 29, shortly after a previous
predicted outburst, showed variable Balmer emission but not the He
II 468.6-nm emission that accompanies large outbursts.  Optical
observations around future predicted maxima are encouraged."


COMET C/1994 T1 (MACHHOLZ)
     Ephemeris continuation (cf. IAUC 6113), from orbital elements
on MPC 24711:

1995 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Feb. 12     2 58.16   - 6 23.4   2.467   2.462   78.1   23.1   13.8
     17     3 00.13   - 6 58.0   2.588   2.501   73.9   22.3   14.0
     22     3 02.51   - 7 27.8   2.707   2.541   69.8   21.4   14.2
     27     3 05.24   - 7 53.9   2.822   2.581   65.9   20.5   14.4
Mar.  4     3 08.27   - 8 17.1   2.934   2.621   62.2   19.5   14.6
      9     3 11.57   - 8 38.1   3.042   2.663   58.6   18.6   14.8
     14     3 15.10   - 8 57.7   3.145   2.704   55.2   17.6   15.0
     19     3 18.83   - 9 16.1   3.245   2.746   52.0   16.6   15.1
     24     3 22.74   - 9 34.0   3.339   2.788   49.0   15.6   15.3
     29     3 26.80   - 9 51.7   3.429   2.831   46.1   14.7   15.5
Apr.  3     3 31.00   -10 09.5   3.515   2.873   43.5   13.9   15.6
      8     3 35.31   -10 27.8   3.595   2.916   41.2   13.1   15.8
     13     3 39.71   -10 46.9   3.670   2.960   39.1   12.3   15.9
     18     3 44.20   -11 07.0   3.740   3.003   37.3   11.7   16.0
     23     3 48.75   -11 28.2   3.805   3.047   35.8   11.1   16.2


1995 February 16               (6136)            Daniel W. E. Green

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